Process of making plaster board



Oct. s Y

o. L. RouTT Pnoczss 0F MAKING PLASTBR Bomb Filed Aug. 23, 1922 nven forning around a roller, 2.

Patented Oct. 25, 1927.

' yUNITED STATES PATENT oFF ICE.

ORVILLE L.. ROUTT, 0F LOS ANGELES, CALIFORNIA.

PROCESS OF MAKING PLASTER BOARD.

Application led `August 23, 1922. Serial No. 563,729.

My invention relates to a new process for making plaster board and iscapable of use in connection with a wall board machine, whereby Such amachine can, with the use of my invention, be readily and comparativelyV terial is removed durin the processto form a rough and slightlyollowed area which forms the bond between the plaster vboard and thecoat of plaster applied thereto. By the removal of-a small amountof theplastic material at the openings through the surface covering, there isprovision for the attachment of the plaster coat and at the same timethe surface of the plast-er board is smooth and free of any projectionsto interfere with piling of the same. By my 1mproved process, am able tomanufacture such a plaster board with a minimum of ma.- chinery andexpense.

In order to clearly explain my` inventlon, I have illustrated one methodof carrying out the process on the accompanying sheet of drawings, whichI will now describe.

Figure l is an edge, or diagrammatic view of an apparatus for carryingout my 1mproved process; l

Figure 2 is an enlarged sectional view of revolving dies "for cuttingVthe openlngs through one sheet of the covering for the plaster board;

Figure 3 is a fragmentary sectional view, enlarged, showing the bottomsheet, the plastic material, the top sheet with the openingstherethrough, and the forming sheet; an

Figure 4 is a view of ter board.

Referring more in detail to the drawings, 1 designates a forming beltorcarrier, run- This may be of any suitable construction. A roll of paper,3, is provided for use in formino' the bottom sheet or surface of theplaster 7board and this is carried forwardly on the carrier 1. Theplatic material, 4, is fed from a hopper, 5, or

the face of the plas- Vother suitable feeding apparatus, on to the sheet3, as illustrated.

Ato pass under the roller 6,

In the present showing of the invention for illustrative purposes,instead of using a-y separate roll of paper for whata I will cal] theforming sheet, I use another roll of paper.

similar to that shown at 3, and, carry it around-a plurality of rollersand pass it twice under the machine roller, 6, said second roll of paperbeing designated 7. I will now trace the course of the paper from thesecond rollV 7. After passing around the roller 6, it passes forwardlyand upwardly around rollers, 8, 9 and 10, and thence between rollerdies, 11 and 12, which cut perforations or openings, 13, through thesheet;l as will be clear from the fragmentary view in Fig. 4, said`openings being here shown as of diamond shape, but which can-befof anydesired form. From the-dies, said sheet passes again around the roller6, and on top of the plastic 'material 4, the upper lap of said papercovering the openings as the sheets pass under the roller 6 and formingthe plastic material into a uniform layer orsheet. As the upper layer orlap of the paper, which Iwill designate 7a, leaves the perforatedsheetand passes up to the take-up rollers 8, 9 and 10, a certain amount ofthe plast-ic material, through the perforations or openings 13, ad-vheres to said upper sheet 7", and 'is brushed therefrom by means of arevolving brush, 14, above the roller 8, as shown in Fig. 1. This leavesa hollowed condition in the platic material at the opening in the facesheet, as indicated at 7b, Athus providing an efficient means forforming a bond between the plas-l ter board and a coat of plaster whenapplied thereto, and at the same time the surface of the plaster boardis smooth-and can be piled Y Hat, one sheet upon another without anyldanger of breaking off projections from the surface thereof. l

It wll be clear, I believe, from the showing made, that my invention canbey applied to' a wall board machine by the simple'provlsion of meansfor putting the openingsthrough the sheet of paper or other/'covering'and then providing a forming or/coveringf sheet above the sheet havingthe openings therein to prevent the plastic material from pressingthrough said openings, and for lifting outa small portion of the plasticmaterial, through the' opening, as the top sheet moves away therefrom.

I am aware that various ways can; be used for accomplishing the processor function described and that changes can be made in the showing made,and I do not, therefore, limit my invention to the showing made eX- ceptas I may be limited by the hereto appended claims.

I claim:

1. The process of manufacturing plaster 4board which consists inpressing a surface sheet having vopenings therethrough on to plasticmaterial, with a lap of said same sheety above the portion having theperforations therein to overlap said perforations, and causing theplastic material at the openings to be roughened by removing the lap ofsaid sheet from the perforated sheet.

v 2. The process of making plaster board consisting of forming plasticmaterial into sheets between two sheets of paper, oneJ Aof said sheetsbeing doubled as it is pressed upon said plastic material, the lap oflsaid paper being pressed directly upon said :plastic material beingperforated and the other lap of said paper covering said perforations assaid plastic material is rolled intog; sheets, and being pulled awaytherefrom aft-er said plast-ic material is formed into sheets andremoving small quantities of said plastic Inaterial through saidperforations, whereby to roughen the same to receive plaster thereupon.i

Signed at Los Angeles, California, this 17 day of August, 1922.

oRvILLE L. RoUTT.

